Add documentation for Kubernetes cross-cluster UI

[mangulonr]

This document introduces the Kubernetes cross-cluster UI, detailing its features, access instructions, and various metrics for monitoring multi-cluster environments.

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[github-actions]

Hi @mangulonr 👋

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[WriteMayur]

netlify build fork

[svc-docs-eng-opensource-bot]

✅ Your PR has been mirrored to our repository as PR #22418.
Commit: 7854bd7affe7d8ab1ece04084844962f7cc5c9ea (7854bd7)
Our workflows will run in the mirrored PR linked above.
🚀 If the build is successful, a Netlify preview will be available shortly at: https://mangulonr-develop--docs-website-netlify.netlify.app

[WriteMayur]

netlify build fork

[svc-docs-eng-opensource-bot]

✅ Your updates have been mirrored to our repository in PR #22418.
Commit: a95faadcc36bb974a237a7fe19832175b27e04f6 (a95faad)
Our workflows will run in the mirrored PR linked above.
🚀 If the build is successful, a Netlify preview will be updated shortly at: https://mangulonr-develop--docs-website-netlify.netlify.app

[WriteMayur]

Closing this PR as CLA check is failing multiple times and created #22448 PR